A partially observed \(N\) -player mean-field game with global state observability (Assumption REF ) is a special case of the finite \(N\) -player stochastic games studied in [1]}, and so Lemma REF  follows from [1]}. Nevertheless, it is informative to study the proof technique, as it can be used to prove existence of equilibrium policies under other observation channels, where existence does not follow from [1]}.
